JPH05332406A - Planetary gear mechanism of automatic transmission - Google Patents

Abstract

PURPOSE:To compact an automatic transmission in its radial direction and prevent an internal gear from collapsing so as to reduce the noise of the transmission. CONSTITUTION:Axially opposite portions 53a, 4a are provided to an internal gear 53 and an output gear 4, respectively, and a connecting groove 4b and a connecting tooth 53c are axially formed in the respective opposite portions 53a, 4a and are fitted with each other and a stopping groove 53d is formed in the inner peripheral surface of the portion where they are fitted with each other, and a snap ring 57 is provided in the stopping groove 53d and a small axial gap (h) is provided between the snap ring 57 and the stopping groove 53d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear mechanism for an automatic transmission, and more particularly to a coupling structure for an internal gear of a planetary gear and a transmission member adjacent to the internal gear.

[0002]

2. Description of the Related Art A planetary gear of an automatic transmission is a sun gear,
It has an internal gear and a pinion gear arranged between these gears and meshed with each gear. And
One of these gears is connected to, for example, the output gear via a transmission member.

Therefore, as a structure in which the internal gear of the planetary gear and the output gear are connected through a transmission member, the description is given in Japanese Utility Model Laid-Open No. 3-22160.
There is a gazette. This publication discloses the following structure. That is, the internal gear is connected to the outer gear via the planetary gear case of the planetary gear unit, and the coupling of the internal gear and the planetary gear case forms a spline on the outer circumference of the internal gear and the inner circumference of the planetary gear case. Then, the two are meshed with each other, and the "ring" in the axial direction due to the thrust load of the internal gear is suppressed by the snap ring.

[0004]

However, in the coupling structure of the internal gear and the transmission member (planetary gear case) as described above, since the spline is formed on the outer circumference of the internal gear, A space is required in the radial direction, which causes a problem that the automatic transmission is upsized.

Further, since the spline coupling is performed in the radial direction, gear noise may occur when the internal gear falls due to a load in the thrust direction or due to poor accuracy, and this noise is generated by the spline. There is a problem that it may be transmitted to the output gear via the coupling portion and may be transmitted to the outside as transmission noise.

The present invention has been made by paying attention to the above-mentioned conventional problems. The automatic transmission is made compact in the radial direction, and further, the internal gear is prevented from collapsing to prevent transmission noise. The purpose is to suppress the.

[0007]

In the present invention, the internal gear and the transmission member are axially coupled to each other to achieve the above object.

That is, the present invention has a sun gear, an internal gear, and a pinion gear which is arranged between these gears and meshes with each gear, and the internal gear is close to the internal gear. In the planetary gear mechanism of the automatic transmission coupled to the transmission member, the internal gear and the transmission member are provided with facing portions axially facing each other, and the facing portions are axially coupled to each other. It is characterized in that a groove and a coupling tooth are formed to fit them together, and further a stop groove is formed on the inner peripheral surface of the fitting portion in the facing portion, and a stop ring is provided in this stop groove. A slight gap may be provided in the axial direction between the retaining ring and the retaining groove.

[0009]

[Operation] The drive torque input to the internal gear is
It is transmitted to the transmission member via the fitting portion between the coupling groove and the coupling tooth in the axial direction. Then, when an axial thrust load is applied to the internal gear, the load is received by the retaining ring.

According to the second aspect of the invention, the internal gear and the transmission member have a degree of freedom about the axis by the amount of the gap between the retaining ring and the retaining groove. ..

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

First, the configuration of the embodiment will be described.

FIG. 2 is a sectional view showing a main part of an automatic transmission to which the planetary gear mechanism of the automatic transmission according to the embodiment of the present invention is applied, in which 1 is an input shaft.

A transmission case (hereinafter simply referred to as a case) 2 and a bearing 3 are provided outside the input shaft 1.
The output gear 4 is rotatably supported coaxially with the input shaft 1 via.

A planetary gear unit 5 is provided outside the input shaft 1. This planetary gear unit 5
Has a Ravigneaux type compound planetary gear train structure in which two pinion gears are respectively meshed with a sun gear. Two sun gears 51 and 52 rotatably provided on the outer periphery of the input shaft 1 and one sun gear Internal gear 53 rotatably provided outside 51 and these gears 5
The first pinion gear 54, which is arranged between the gears 1 and 53 and meshed with the gears 51 and 53, and the pinion gear 5
4 and a second pinion gear 55 that is connected by a carrier 56 and meshes with the sun gear 52.

The internal gear 53 is connected to the output gear (transmission member) 4 adjacent to the internal gear 53.

Next, the connecting structure of the internal gear 53 and the output gear 4 will be described with reference to FIG.
That is, the internal gear 53 and the output gear 4
Are arranged so as to face each other in the axial direction, and the right end portion of the internal gear 53 in the drawing and the left end portion of the output gear 4 in the drawing respectively face the facing portions 53a, 4a is provided. And the facing part 5
3a and 4a respectively include coupling grooves 53b and 4 in the axial direction.
b and connecting teeth 53c and 4c are formed alternately.
3 and 4 are part diagrams of the internal gear 53 and the output gear 4, respectively, in which (a) is a sectional view and (b) is a front view. As shown in these figures, the connecting grooves 53b, 4b and the connecting teeth 53c, 4 are provided on both sides.
Four c are formed, and the coupling groove 53b and the coupling tooth 4c are fitted to each other, and the coupling tooth 53c and the coupling groove 4b are fitted to each other.

Further, as shown in the drawing, the facing portions 53a, 4a
Stop grooves 53d and 4d are circumferentially formed on the inner circumference. Then, as shown in FIG. 1, the stop grooves 53d, 4
A snap ring (retaining ring) 57 is provided in d. A slight gap h is provided in the axial direction between the stop grooves 53d and 4d and the snap ring 57.

Next, the operation of the embodiment will be described.

The driving torque input to the internal gear 53 is the coupling groove 53b and the coupling tooth 4c or the coupling groove 53.
It is transmitted to the output gear 4 via the fitting portion formed by c and the coupling tooth 4b.

The thrust load between the internal gear 53 and the output gear 4 is received by the snap ring 57 in either direction. Further, since a slight gap h is provided in the axial direction between the snap ring 57 and the stop grooves 53d, 4d, the internal gear 53
The output gear 4 and the output gear 4 have a degree of freedom in angle about the axis, and are not affected by mutual tilting, poor accuracy, or the like.

As described above, in this embodiment, since the internal gear 53 and the output gear 4 are fitted in the axial direction, a space is not required in the radial direction of the internal gear 53, and the automatic transmission is not required. It can be made compact.

Further, the accuracy of thrust load between the internal gear 53 and the output gear 4 and the inaccuracy due to mutual tilting are absorbed in the fitting portions of the coupling grooves 53b, 4b and the coupling teeth 53c, 4c. Therefore, it is possible to suppress the occurrence of transmission noise due to these factors.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific structure is not limited to this embodiment, and even if there are design changes within the scope not departing from the gist of the present invention. Included in the present invention.

[0025]

As described above, in the planetary gear mechanism of the automatic transmission according to the present invention, the internal gear and the transmission member are axially opposed to each other and are fitted at the opposed portions. Space is not required in the radial direction of the internal gear, and the effect that the automatic transmission can be made compact is obtained, and the internal gear is not affected by tilting or poor accuracy, and noise caused by these It is possible to obtain the effect of suppressing the occurrence of

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of essential parts of a planetary gear mechanism of an automatic transmission according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main part of an automatic transmission to which the mechanism of the embodiment is applied.

FIG. 3 is a component diagram including a sectional view (a) and a front view (b) showing an internal gear of the embodiment mechanism.

FIG. 4 is a component diagram including a sectional view (a) and a front view (b) showing an output gear of the embodiment mechanism.

[Explanation of symbols]

 4 Output Gear (Transmission Member) 4a Opposing Part 4b Coupling Groove 4c Coupling Tooth 4d Stop Groove 5 Planetary Gear Unit 51 Sun Gear 53 Internal Gear 53a Opposing Part 53b Coupling Groove 53c Coupling Tooth 53d Stop Groove 54 Pinion Gear 57 Snap Ring (Snap Ring) ) H gap

Claims (2)

[Claims] 1. A transmission member having a sun gear, an internal gear, and a pinion gear arranged between these gears and meshed with the respective gears, wherein the internal gear is in the vicinity of the internal gear. In the planetary gear mechanism of the automatic transmission coupled to, the internal gear and the transmission member are provided with facing portions facing each other in the axial direction, and the facing grooves and the connecting teeth are axially provided in each of the facing portions. And a fitting groove is formed on the inner peripheral surface of the fitting portion in the facing portion, and a snap ring is provided in the fitting groove. mechanism. 2. The planetary gear mechanism for an automatic transmission according to claim 1, wherein a slight gap is provided in the axial direction between the retaining ring and the retaining groove.